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cxl/region: Drop redundant pmem region release handling

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Now that a cxl_nvdimm object can only experience ->remove() via an
unregistration event (because the cxl_nvdimm bind attributes are
suppressed), additional cleanups are possible.

It is already the case that the removal of a cxl_memdev object triggers
->remove() on any associated region. With that mechanism in place there
is no need for the cxl_nvdimm removal to trigger the same. Just rely on
cxl_region_detach() to tear down the whole cxl_pmem_region.

Tested-by: Robert Richter <rrichter@amd.com>
Link: https://lore.kernel.org/r/166993041215.1882361.6321535567798911286.stgit@dwillia2-xfh.jf.intel.com
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams
2022-12-01 13:33:32 -08:00
parent cb9cfff82f
commit 16d53cb0d6
3 changed files with 0 additions and 93 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/cxl/core/pmem.c
-2
View File
@@ -188,7 +188,6 @@ static void cxl_nvdimm_release(struct device *dev)
{
struct cxl_nvdimm *cxl_nvd = to_cxl_nvdimm(dev);
xa_destroy(&cxl_nvd->pmem_regions);
kfree(cxl_nvd);
}
@@ -231,7 +230,6 @@ static struct cxl_nvdimm *cxl_nvdimm_alloc(struct cxl_memdev *cxlmd)
dev = &cxl_nvd->dev;
cxl_nvd->cxlmd = cxlmd;
xa_init(&cxl_nvd->pmem_regions);
device_initialize(dev);
lockdep_set_class(&dev->mutex, &cxl_nvdimm_key);
device_set_pm_not_required(dev);
drivers/cxl/cxl.h
-1
View File
@@ -424,7 +424,6 @@ struct cxl_nvdimm {
struct device dev;
struct cxl_memdev *cxlmd;
struct cxl_nvdimm_bridge *bridge;
struct xarray pmem_regions;
};
struct cxl_pmem_region_mapping {
drivers/cxl/pmem.c
-90
View File
@@ -27,26 +27,7 @@ static void clear_exclusive(void *cxlds)
static void unregister_nvdimm(void *nvdimm)
{
struct cxl_nvdimm *cxl_nvd = nvdimm_provider_data(nvdimm);
struct cxl_nvdimm_bridge *cxl_nvb = cxl_nvd->bridge;
struct cxl_pmem_region *cxlr_pmem;
unsigned long index;
device_lock(&cxl_nvb->dev);
dev_set_drvdata(&cxl_nvd->dev, NULL);
xa_for_each(&cxl_nvd->pmem_regions, index, cxlr_pmem) {
get_device(&cxlr_pmem->dev);
device_unlock(&cxl_nvb->dev);
device_release_driver(&cxlr_pmem->dev);
put_device(&cxlr_pmem->dev);
device_lock(&cxl_nvb->dev);
}
device_unlock(&cxl_nvb->dev);
nvdimm_delete(nvdimm);
cxl_nvd->bridge = NULL;
}
static int cxl_nvdimm_probe(struct device *dev)
@@ -243,21 +224,6 @@ static int cxl_nvdimm_release_driver(struct device *dev, void *cxl_nvb)
return 0;
}
static int cxl_pmem_region_release_driver(struct device *dev, void *cxl_nvb)
{
struct cxl_pmem_region *cxlr_pmem;
if (!is_cxl_pmem_region(dev))
return 0;
cxlr_pmem = to_cxl_pmem_region(dev);
if (cxlr_pmem->bridge != cxl_nvb)
return 0;
device_release_driver(dev);
return 0;
}
static void offline_nvdimm_bus(struct cxl_nvdimm_bridge *cxl_nvb,
struct nvdimm_bus *nvdimm_bus)
{
@@ -269,8 +235,6 @@ static void offline_nvdimm_bus(struct cxl_nvdimm_bridge *cxl_nvb,
* nvdimm_bus_unregister() rips the nvdimm objects out from
* underneath them.
*/
bus_for_each_dev(&cxl_bus_type, NULL, cxl_nvb,
cxl_pmem_region_release_driver);
bus_for_each_dev(&cxl_bus_type, NULL, cxl_nvb,
cxl_nvdimm_release_driver);
nvdimm_bus_unregister(nvdimm_bus);
@@ -378,48 +342,6 @@ static void unregister_nvdimm_region(void *nd_region)
nvdimm_region_delete(nd_region);
}
static int cxl_nvdimm_add_region(struct cxl_nvdimm *cxl_nvd,
struct cxl_pmem_region *cxlr_pmem)
{
int rc;
rc = xa_insert(&cxl_nvd->pmem_regions, (unsigned long)cxlr_pmem,
cxlr_pmem, GFP_KERNEL);
if (rc)
return rc;
get_device(&cxlr_pmem->dev);
return 0;
}
static void cxl_nvdimm_del_region(struct cxl_nvdimm *cxl_nvd,
struct cxl_pmem_region *cxlr_pmem)
{
/*
* It is possible this is called without a corresponding
* cxl_nvdimm_add_region for @cxlr_pmem
*/
cxlr_pmem = xa_erase(&cxl_nvd->pmem_regions, (unsigned long)cxlr_pmem);
if (cxlr_pmem)
put_device(&cxlr_pmem->dev);
}
static void release_mappings(void *data)
{
int i;
struct cxl_pmem_region *cxlr_pmem = data;
struct cxl_nvdimm_bridge *cxl_nvb = cxlr_pmem->bridge;
device_lock(&cxl_nvb->dev);
for (i = 0; i < cxlr_pmem->nr_mappings; i++) {
struct cxl_pmem_region_mapping *m = &cxlr_pmem->mapping[i];
struct cxl_nvdimm *cxl_nvd = m->cxl_nvd;
cxl_nvdimm_del_region(cxl_nvd, cxlr_pmem);
}
device_unlock(&cxl_nvb->dev);
}
static void cxlr_pmem_remove_resource(void *res)
{
remove_resource(res);
@@ -508,10 +430,6 @@ static int cxl_pmem_region_probe(struct device *dev)
goto out_nvb;
}
rc = devm_add_action_or_reset(dev, release_mappings, cxlr_pmem);
if (rc)
goto out_nvd;
for (i = 0; i < cxlr_pmem->nr_mappings; i++) {
struct cxl_pmem_region_mapping *m = &cxlr_pmem->mapping[i];
struct cxl_memdev *cxlmd = m->cxlmd;
@@ -538,14 +456,6 @@ static int cxl_pmem_region_probe(struct device *dev)
goto out_nvd;
}
/*
* Pin the region per nvdimm device as those may be released
* out-of-order with respect to the region, and a single nvdimm
* maybe associated with multiple regions
*/
rc = cxl_nvdimm_add_region(cxl_nvd, cxlr_pmem);
if (rc)
goto out_nvd;
m->cxl_nvd = cxl_nvd;
mappings[i] = (struct nd_mapping_desc) {
.nvdimm = nvdimm,